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Apparently the energy to cut nails transversely, at approximately 3 kJ m–2, is about half that needed (approx. 6 kJ m–2) to cut them longitudinally. Now you know why these beads of sweat appear on the forehead when doing a wedged resection of the nail.
Farren L, Shayler S. and Ennos A.R. 2004 The fracture properties and mechanical design of human fingernails Journal of Experimental Biology 207, 735-741.
Have you ever wondered?
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